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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94e7fbbfb4242f5e2f4d5b92b5d6af83172a485e6c901b0ce1ca60f0c3076142' 
  AND token = 'OxjlrneXEgQq0LnADz+ERWX22zzW34psZelNnZGqM5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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