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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c303fa67b1264bc2851fedc05e7671d8df8d2b09b590ccd40907eb723b3fea16' 
  AND token = '3gLLTg95yWasKGG/S01/vhHMduYwbME91qi1XpXTByw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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