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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e0e12bd855dd1d4f9db8e9d551737edeb0d10c266133a71238852b85b70b8e3' 
  AND token = 'K1eXRxxmgeCQKoUZG5tiSckSF25rxv/+FRfzxV2ziuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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