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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '878ae2f44ce09c07ebf5f39b09130f5facd1a924892ad4956843cfaed5896c3e' 
  AND token = 'enb2wbKGKuyv48L2ieLePunu5HUyagDFSsL8T6k8660=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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