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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edc8b26ff2b03ba8f2b48a92d923ee2d0559e91419bb7eb382627b0b790b2878' 
  AND token = 'yY6af6r/i5eVIvmhu9J+ENE3grg9tqsI+LWveVragi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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