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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ef11d95e6e8772d29afb4db59d25c4a9851049efedb3d85d47285524390e64f' 
  AND token = 'l205AlETDZ0TZv7ckxFuJN+k6OdHqyabd8X3KlHOUmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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