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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26166ea2656c64517e7d09eae6d2fe76473ed358e03a7d6400a8d44204fe0e5c' 
  AND token = 'TMnszmImki1yT4WrF7vFPDLfgImnztz8XU9PmelSKyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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