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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4e7d4fdf58326d722e6f2934df50a7b91a974235abc5076f6344bc45f6e6d17' 
  AND token = 'Z5mVbI/RRUw7oCLNV0t/b6nWRow/ZA5fPCM71gYcYYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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