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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14dd908c940f377a5b0f244a12999a66ef02b3596c7bb1df74e300be5fcacf7f' 
  AND token = 'uJ7UHVAKPvCK8Qqe/8+wZ7k/CHJw4WW7Uy4RfucJRk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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