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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d7d9bbe3800711824fcb29dbc4709ab89477c5859c1cd7620418f05f8c99067' 
  AND token = 'PCN7lJ4YjxpFfDQivLoLFC57ENPWXmeu3imMk8nN9MY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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