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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc68636503eccf3ee4baeb1673283d5ebaf69cfcbb05c4a40ecfeffc746a643d' 
  AND token = '2pLNkDfX0AuM+OFVoQnWcv+r6N1GH1cIrPpN7A4mY5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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