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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1e91be8ff578548bf5354df72336443f7b4dc628c9761a8d243fc488be46387' 
  AND token = '15iSsq10USXLa5PgiuS5xBkHKZ8zHT/TO9bnxSZkiA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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