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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77529719953fdbf536631ca021c5f14a47787d03769bf458310fe11fe465f674' 
  AND token = 'NxCp1dIc2IOZYhn0iKA4S2R7O7Q+Qn3eyuqqFr74WNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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