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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4150c24deb77de07737ba0539681e84bff4a8ca60dca3be45f7212df400b92d4' 
  AND token = 'pH44dC5oUtJYCkmJ48jB7hMXHkv4Md8OxDxLPA3D5zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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