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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a4e11fb00b9f7af894aac4dee97ae0da3b63641f07638d2cb5d75ed73d082b' 
  AND token = 'JxQijUKZWocKumZobBFCAyB8SmsGqel2ajotgBHUtsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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