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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58e56de9b5ef314c7d017a8895f29cef392f6aa04074a34a4aa327ec0c834c92' 
  AND token = 'axkooyGYS7cY6tSEO+nqmg9FZbzx2BbAP36cA1XqMqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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