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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eb51bd17435eabfc09c4a02e25d4f0953eb2c971d021461eca7f6b14721a898' 
  AND token = 'Y7xcC56JlVjb9/s/NT+ZbILQ9Zb6WxBAo820+yWraZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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