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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38f79276d6c8519e8a1ea6b1b389c68056e5e533e4b73805188c1fa86ca3a5bf' 
  AND token = 'KAeK1fEKzNMZ4iGK8PyqIkIOc2atA6OTLcufOqp4jzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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