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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78bc944f2ebb072604f2b75e42c4698b398c806556c4f53960f5f0bb2013254a' 
  AND token = 'mAP2oV0vcOSnAxYmjdRK3TyH3aWHAKAA3bPYZf+WhHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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