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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e575a27530259ba16fdc2ef4d22341e4ea5b96c0f442d3f5d5d06d6272b7fa94' 
  AND token = 'QuW9eSkJZXcWOzqViXP91RbEvahkPOk8IiZgXknNoNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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