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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a0f1e99a189d9200d6e1bf04bc867ce41b9025d25a3515c070d4de0dc5b3de5' 
  AND token = 'YT8TdfpAdfYqTkVCT1imS1pTGc7+ImL79u/ixus6H6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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