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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87fb5a18ce42148893bb5780717c31e8b9d62aa8caf1088c3abf11d03b1a83d3' 
  AND token = 'IEN4R2vgd+Fq7JaIy9bKjNCc2USyBVeKZH6idAF9xgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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