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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '250b467d30bf5846802036286a1c4b54a695d42fa3e041df0a5ecc29a822b5a5' 
  AND token = '3D93vKiX7Sv5yep95RDFh6WaoUFP+fuutnRJmkJdGjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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