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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd23f90c9c3df652eb51281be55c5462fb723fdd22c97cc2d894efd227154c2d3' 
  AND token = 'qQ6Wo0E/ctX0cUnedXA+EU4VVUlabp78Xd6lqgdKYnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}