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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c210f7d62c98c35ab15e4ca2f97c081239945f4330538398ebc5b8efba30893d' 
  AND token = '2fNp8LtX5Q03EBaL4caMXPbEzW1OAZhkovXZ1rLMbHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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