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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e772977ab857d95ee4ab56dc460f5b4d2e9c8f8d0e23ae657c844e55e6f8c99' 
  AND token = 'nmJm877DV2kCdJmRdY+D1Y9NM3JlwRqzybYHXHai9Oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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