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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fec46ffbbbfabd7c1a4e94507223b1a0cfa9ab1f0c8017cdd81170e4408a3b7' 
  AND token = 'EjM4ef9pLIV1AlMl0a4s5mdFqoIphglByVzgc5LbXI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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