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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd2b0b49dd448965f1494101c9929bafb3eb8c1f1f90b9e12d724bbcd790cd19' 
  AND token = '0N1bZ8HuK16WZ5e4at8D6aFofg3p0AYdRZmqQIunHyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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