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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f306f2cd42e3696e5370e360cd5ce2407a1c3ae036289dacaf867fddafa84fe0' 
  AND token = 'zTupxyU02/Z0KGV1ocRT9f1CQSMVRh2qW61lZ7QKI9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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