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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f8ae3abb0e7fa4f82d5be2034fb3b5a605d6a0d2a4fcff46992cab8bd483181' 
  AND token = 'rXN2Au0+YZXnHHTp4NLP8c+AQUbi+1JMHz15iQ4RQx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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