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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb12d00fe1d9e570bb359abdaf927587891f8d6cd7c20a24b5aa83fd3fa0bc70' 
  AND token = '9RppjxTL3hm1fZ2h2cq6xbC6jkoyghjjzahTWKlomsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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