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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c7da883c63c9f01f0fa73a20cfe9b51f462f9ae80e985a3a508d2cf584cd8d5' 
  AND token = 'H//uBnnw4itkosf0zAv59SmD5/SHHNld0MWSLRC+XkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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