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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e517fa491baa7dfe7923e5a3480567c6e1aecb0a838e4ec64bd2d6361f3b5eae' 
  AND token = 'dyUunD2Uxccv2r3kl29TlLLIgFkTDwGVBn/CHONJwGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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