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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e68d8c6f88e6abff61f7fc9896bdfea6fbaeba1d48076afbb6c8d8288517bd1' 
  AND token = 'leKGsXLxtSakXzmTYc/jnYp3zmDxC1StjF9klHm52Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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