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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3abbdb56118b97f86927850bcdb8aef27d7eb5686d7571f85e6bf40038e73fd0' 
  AND token = '9K/dLB2l3JiBCyp4ieux6rGVd6jdVo+Eaus8APFwVBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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