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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a697d080380a52ee89afed1fde0ca645085255c20a725fb3830be29b03883b4b' 
  AND token = 'kYMF3uh6asQEgnYm/2Bfy2k8ba5Rdu3OjzNkHD0Ep0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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