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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7542025e5fe75b7c5201b6fa685623a3147891888ae93edea4d1e4e04d7af2a' 
  AND token = 'U+3NxDyoyesHoIMBMnZWRcR0qEzz92I8dD/7mIVURGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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