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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d1c82c72a48458c913490f97635ebb91e64cda0a15d398c1b16f714580364a6' 
  AND token = 'WjgcvmX9skL9Hk2WlvXlZDurk0jtphjnae44XRHmG3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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