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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab40b0798f18b3c8106c5204c653cc2aed5dc46319a2b67b4350319fe430e799' 
  AND token = 'wB1RHVhfPS4a3MBd3o18kdb//fGmcO86el/P9YvbSNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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