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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc55a34e9341a8f33ac0acc73697f928224617c2614b1933763a611a99ab15b0' 
  AND token = 'tCE6ivQWrARTrbUIwAYce9UO7HG4iKcX2SYzT6BJI4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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