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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd90cfa6eb12ae4c6bb5faec0756fbe4f03fdc2531206f5fff0233c0280facb4a' 
  AND token = '0t+L8pfdykMz5Odf06iO5HFNKQLWLWCpR18lrEf1S1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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