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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af3a9f26224e9099d5db715724c6577a3fc3317fb141a08158c1cc8788fe7c51' 
  AND token = 'Fwh4GsUd+NtIun9QNskRu+iVXX/dtRAbOfe0+c6FChI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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