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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea3e7fc3c6e4d1477c912fa4398a526af143a78eb1c28b2f8e7043b059cd4fe2' 
  AND token = 'nhlw+9sPPqQRMo1RTVh9wi3qornb6eP/ZzfL7tB/MCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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