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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd70dd6d7ffe8dab21c4a2f9670b8b3f76ecc6fcf14623a607fb006de74d96cc3' 
  AND token = 'ToZ1EIzOwtHaI27fByWSyBN5RILh0xHPt74DeUSNX/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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