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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7006cb41a16b77f22bf5437d6f4085e60a6109d5dc321847193dee783bde06f5' 
  AND token = '6Tzbf9/nVOJIcvaINbSk4EjQFo+0nHQzpyciaTDU8X0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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