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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8158a8a3a5ab4eb558845d2d6760ac456c69ba9abf87e1bbea47ac6c2151bd3' 
  AND token = 'idHPwwWhh/GdBJESh+JrpXJycA2q+nqcG/u+4ywZGMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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