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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1871cf29413facf33cff341a00118bdaa0258f04fe864f22c631e9d317bf46bd' 
  AND token = 'HitIlxFKZDSGv3sS0sWoT9FTE/HdWrIczJ2DObW42XQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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