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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7352aa85a338238989a9a4fe84c328af1c110671604bf6c28cba76120308f35a' 
  AND token = 'NakYzOCJjAKcAamgs3LPL8KF6qg9Q5y38VIUTG585ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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