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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6d3000111d7df9fbc682204753590c1de073f57d72e68452d50191b5da1b75b' 
  AND token = 'DezwvtbiPxoui599OR1YYJbYqSteqMWWJJhdexfjWu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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