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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fdaaaa913eaaed9cacdbc264b187cfc4c964e4e4faed5b0186316448316eac5' 
  AND token = 'U6l+HGiTzH5XXErAcZeu5Aipz95s48GZKZfHAgw86RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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