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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4b69c47e9dfecde77dedb25d0926437e63e140d8bc36d04303fe43f65764ec1' 
  AND token = 'BLsMoW3KLvu+Ahx6M8PLSybtoG/C23s+psGPRjP9w2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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