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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5afaa2728b1adc87d9302a913b336578236fc085a06093d1e748cb3b84a17bab' 
  AND token = 'RT/GY7nL07H6YldbQ7VV8aeQ8W4CDNFcrGYeNr3wpDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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