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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b674ebad70d5852f020d6d9d8683902f20197bbfad2461fcf5b04a5e02e65d37' 
  AND token = '1dqg+pUpDab0tMMpJvHvl/TiFAW6EW+AxjExvJHAQSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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