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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d4f930fe74c9535918724fe65f0b8061ac640fac11be00bddc9934b5863f1a2' 
  AND token = 'k26A9BTg9LkqUk6ycCgvYP/cTPq5UA1OaJUwFnyowDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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