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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0f40dca662d1caae6418ce65eeea416f65a3cf779909ef6d18188b0a59fe62b' 
  AND token = '0NIVCh9SCSVsC78npRukdbtisqA+Wfe0fwKTzzNdCWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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