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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ddf51a9b458ccffbe21f74d32ce2cf189b5f98c056a0a8c69fccf92933f772' 
  AND token = 'mIihapTOwnwy/C3mdFwG2Etn5C4GIhGQsi8wGEE6gy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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