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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '015f34c8ec9c3241838c3888a73153d88daa2d0d6678027e5e079e71f1180cb2' 
  AND token = 'eC7uoZ0E+UNO7eK09Mv2e89HUPPeHjqqjepmn8tCgP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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