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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba6ec543d2eb9ec332fc032a1173d5558a13b48467fe62564d995c7842dcc391' 
  AND token = '5d2BpJleuze0Ox7DjR25TRlGZQemqAEoC2GvrtcEhSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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