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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46987d884e173804763bfa8420275e1c7fd15f8f10bf14baf2fef5f49b58a134' 
  AND token = '19Af1tLQdKRHnE6J+mFqrvfFRIVR0DDgADHDy7fl9j0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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