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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ac09daae67857d0ac063ff0b47321e7bc7883f210e2b231e6fead4e3fd979d' 
  AND token = '1KbQ9rR1AncasMpBi3qWHKo4Ti3WHd7yBZUfkVioGoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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