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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee663f88eed5e4404c067432191d0577717060fb201e5d0d524654129550c280' 
  AND token = 'zsi9ERgjSz7OYPCpDBz9zK6j279H1WBSQI5NUNaJjrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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